CN100557731C - An electronic transformer with anti-stealing function - Google Patents

Abstract

The invention relates to an electronic transformer with an anti-stealing function, which belongs to the field of high-voltage equipment and electronic technology. Including voltage/current sensing head, self-powered power supply module, signal processing module and anti-theft metering module. Among them, the self-powered power supply module is used to provide a regulated power supply for the signal processing module, the voltage/current sensor head is used to detect the user's voltage and current signals, and the signal processing module is used to process and output analog signals of voltage and current, anti-theft measurement The module is used to calculate the user's power consumption and grid information, send it wirelessly, and receive and restore the user's power consumption and grid information at the terminal. The advantage of the electronic transformer of the present invention is that it has the function of anti-stealing electricity, saves the electric energy meter in the original metering system, eliminates the error caused by the electric energy meter, improves the accuracy and reliability of the metering system, and realizes digital power system It provides a certain basis for the unified management of power systems.

Description

An electronic transformer with anti-stealing function

technical field

The invention relates to an electronic transformer with an anti-stealing function, which belongs to the field of high-voltage equipment and electronic technology.

Background technique

Accurate and reliable electricity metering is a prerequisite for safe and stable operation of power systems and electricity market transactions. The current metering system is mainly composed of electromagnetic transformers (including voltage transformers PT and current transformers CT) and meters. The transformer inputs the analog signal representing the fundamental voltage, current magnitude and phase into the meter, which calculates the current power consumption. This metering method brings an opportunity for stealers. Electric energy measurement is mainly determined by the product of voltage, current, power factor and time. Changing any element can make the electric energy meter run slowly, stop or even Inversion, thus affecting the accurate measurement of the energy meter. Especially in the high-voltage power supply and low-voltage metering mode, the user can even change the metering results of the energy meter by changing the secondary side wiring and other methods without affecting the loop power supply. Stealing electricity has caused huge losses to the power supply department.

Anti-stealing technical measures mostly adopt the method of special metering box or special meter box. By using primary or secondary equipment that prevents the user from touching the metering device; or when the user touches it, the device will automatically power off and give an alarm, which can only be released by the personnel of the power supply bureau to achieve the purpose of preventing electricity theft. However, such methods are not easy to maintain, and their protective effect will be reduced after long-term use.

With the development of electronic technology, microcomputer technology, and optical fiber communication technology, traditional electromagnetic transformers are gradually being replaced by new types due to problems such as large size, small dynamic range, narrow frequency response range, ferromagnetic resonance, magnetic saturation, and poor safety performance. The electronic transformer is replaced. According to whether the high-voltage sensing part needs external energy supply, the electronic transformer can be divided into active type and passive type. At high voltages, especially above 110kV, electronic transformers mostly use optical fibers to transmit information; at medium and low voltage levels with small insulation distances, optical fibers or insulated cables can be used to transmit information. Regardless of the power supply method and the medium for transmitting information, they all use electronic components for sampling, processing, and even output signals. The emergence of electronic transformers provides the possibility for a new anti-stealing technology. However, the existing electronic transformers do not have the function of anti-stealing electricity.

Invention content:

The purpose of the present invention is to propose an electronic transformer with anti-stealing function. The electronic transformer is used to detect the voltage and current of the transmission line, and the user's power consumption, power factor, and harmonics are calculated from the detected amount. , fault and other information. After the above information is digitized, it is sent in real time by the integrated wireless communication module in the transformer, and is wirelessly received and restored at the remote terminal to measure, thus avoiding electricity theft.

The electronic transformer with anti-stealing function proposed by the present invention includes:

Sensor head for measuring voltage and current, self-powered power supply module, signal processing module and anti-theft metering module;

The self-powered power supply module is connected to the signal processing module to provide a regulated power supply for the signal processing module;

The sensor head for measuring voltage and current is connected to the signal processing module, used to detect the user's voltage and current signals, output an optical signal or an electrical signal proportional to the voltage and current, and provide voltage for the signal processing module and current signal;

The signal processing module is used to convert the analog output of voltage and current through photoelectric conversion, amplification, shaping and filtering, so as to obtain analog signals representing user voltage and current;

The anti-stealing metering module is composed of a data processing module, a wireless communication module, and a wireless terminal module, wherein the data processing module is connected to the signal processing module, and is used to receive analog signals representing user voltage and current from the signal processing module. After A/D conversion and calculation, the digital signal of power consumption and power grid information is obtained. The wireless communication module is connected with the data processing module to send the digital signal of the data processing module and receive the operation instruction signal of the wireless terminal. The wireless terminal module is used to receive the digital signal of the wireless communication module and send the operation command signal, and display the power consumption and grid information.

The sensing head for measuring voltage and current in the above-mentioned electronic transformer includes a current sensing head and a voltage sensing head, wherein the current sensing head is placed in the bus bar of the power supply system, and the voltage sensing head is placed in the bus bar and between ground potentials. The sensing heads for voltage and current in electronic transformers can be optical or non-optical.

The data processing module in the above-mentioned electronic transformer is composed of an A/D conversion module and a power calculation and information processing module; the A/D conversion module converts an analog signal representing voltage and current into a digital quantity; power calculation and information processing The module is composed of a first digital signal processor and a memory. The first digital signal processor calculates the user's power consumption, power factor, and harmonics according to the digital output of the A/D conversion module, and the output from the A/D conversion module The digital quantity obtains the current operating status of the power grid system.

The wireless terminal module in the electronic transformer is composed of a wireless transceiver module, a second digital processor, a memory, a keyboard, a display terminal and a communication interface, and the wireless transceiver module, memory, keyboard, display terminal and communication interface are respectively connected with The second digital processor is connected, wherein the wireless transceiver module is used to receive the digital signal of the wireless communication module and send an operation instruction signal; the described memory is used to store the digital information received by the wireless communication module; the described keyboard is used to key in the user Operation instructions; the display terminal is used to display the user's electricity and grid information; the communication interface is used to output the user's electricity and grid information.

The self-powered power supply module in the above-mentioned electronic transformer is composed of a power-taking coil, a voltage stabilizing circuit, a charging circuit and a battery pack power supply switching circuit. The power-taking coil is connected to the power grid, and connected to the voltage stabilizing circuit through a rectifier bridge, which is used to obtain electric energy from the grid to provide DC for the voltage stabilizing circuit; the voltage stabilizing circuit is connected to the charging circuit to provide charging voltage for the battery pack. And provide working power for the electronic circuit of the whole transformer; the battery pack power supply switching circuit is connected between the charging circuit and the voltage stabilizing circuit, and is used for switching the power supply mode when the power supply fails.

The electronic transformer with anti-stealing function proposed by the present invention has the following advantages:

1. The electronic transformer with anti-stealing function of the present invention uses the electronic transformer to detect information such as power consumption and faults of the user, and integrates the wireless transceiver module into the transformer to realize local transmission of information in a wireless manner Receiving with the terminal, the received information is restored and used for metering, which effectively avoids the user's electricity theft.

2. In the electronic transformer of the present invention, since the electric energy meter in the original metering system is omitted, the error caused by the electric energy meter is eliminated, thereby improving the accuracy and reliability of the metering system.

3. The electronic transformer with anti-stealing function of the present invention provides a certain basis for realizing the digital power system and the unified management of the power system.

Description of drawings

Fig. 1 is a structural block diagram of an anti-stealing electronic transformer proposed by the present invention.

Fig. 2 is another structural form of the anti-stealing electronic transformer proposed by the present invention.

Fig. 3 is a circuit block diagram of a +15V regulated power supply and a charging module in the electronic transformer of the present invention.

Fig. 4 is a structural block diagram of the anti-theft metering module in the electronic transformer of the present invention.

Fig. 5 is a terminal structure diagram in the anti-theft metering module.

In Fig. 1, 1 is a current sensing head, 2 is a voltage sensing head, 3 is a power coil, 4 is an insulator, and 5 is a busbar.

Detailed ways

The electronic transformer with anti-stealing function proposed by the present invention has a structural block diagram as shown in Figure 1, including: a sensor head for measuring voltage and current, a self-powered power supply module, a signal processing module and an anti-stealing metering module. Self-powered power module The self-powered power module is connected to the signal processing module, and is used to provide a regulated power supply for the signal processing module. The sensor heads for voltage and current are connected to the signal processing module to detect the user's voltage and current signals, output optical or electrical signals proportional to the voltage and current, and provide voltage and current signals for the signal processing module. The signal processing module is used to convert the analog output of voltage and current through photoelectric conversion, amplification, shaping and filtering to obtain analog signals representing user voltage and current. The anti-stealing metering module is composed of a data processing module, a wireless communication module, and a wireless terminal module. The data processing module is connected to the signal processing module, and is used to receive the analog signal representing the user's voltage and current from the signal processing module. After conversion and calculation, the digital signals of power consumption and power grid information are obtained, and the wireless communication module is connected with the data processing module to send the digital signal of the data processing module and receive the operation command signal of the wireless terminal. The wireless terminal module is used to receive the digital signal of the wireless communication module and send the operation command signal, and display the power consumption and grid information.

The sensing head for measuring voltage and current in the above-mentioned electronic transformer includes a current sensing head and a voltage sensing head, wherein the current sensing head is placed in the bus bar of the power supply system, and the voltage sensing head is placed in the bus bar and between ground potentials. The sensor head can be optical or non-optical.

The data processing module in the above-mentioned electronic transformer, as shown in Figure 4, is made up of A/D conversion module and power calculation and information processing module; Described A/D conversion module converts the analog signal of characterizing voltage and current into digital The power calculation and information processing module is composed of a first digital signal processor and a memory. The digital signal processor calculates the user's power consumption, power factor and harmonics according to the digital quantity output by the A/D conversion module, and obtains the data from the A/D conversion module. The digital output of the D conversion module obtains the current operating status of the power grid system, including whether there is a fault, the type of fault (overcurrent, overvoltage, undervoltage, etc.), and the above-mentioned digital signal processor can also be replaced by a single-chip microcomputer or a dedicated electric energy metering module.

The wireless terminal module in the above-mentioned electronic transformer, as shown in Figure 5, is made up of wireless transceiver module, second digital processor, memory, keyboard, display terminal and communication interface, described wireless transceiver module, memory, keyboard, The display terminal and the communication interface are respectively connected to the second digital processor, wherein the wireless transceiver module is used to receive the digital signal of the wireless communication module and send an operation command signal; the memory is used to store the digital information received by the wireless communication module; The above-mentioned keyboard is used to input user operation instructions; the above-mentioned display terminal is used to display the user's electricity and grid information; the described communication interface is used to output the user's electricity and grid information.

The self-powered power supply module in the above-mentioned electronic transformer, as shown in FIG. 3 , is composed of a power-taking coil, a voltage stabilizing circuit, a charging circuit and a battery pack power supply switching circuit. The power-taking coil is connected to the power grid, and connected to the voltage stabilizing circuit through a rectifier bridge, which is used to obtain electric energy from the grid to provide DC for the voltage stabilizing circuit; the voltage stabilizing circuit is connected to the charging circuit to provide charging voltage for the battery pack. And provide working power for the electronic circuit of the whole transformer; the battery pack power supply switching circuit is connected between the charging circuit and the voltage stabilizing circuit, and is used for switching the power supply mode when the power supply fails.

The wireless communication module is mainly composed of wireless sending and receiving chips. It can realize wireless data transmission and reception for GSM, CDMA, GPRS, infrared, Bluetooth and other modules.

The wireless terminal module in the above-mentioned electronic transformer, as shown in Figure 5, is mainly composed of a wireless transceiver chip, a terminal signal processing module, a keyboard and a display module, and a terminal regulated power supply module. The wireless sending and receiving chip corresponds to the chip in the wireless networking module. The terminal signal processing module is a single-chip microcomputer or DSP and peripheral circuits. It obtains information such as the user's voltage, current, power consumption, power factor, harmonics, and faults from the received wireless data, and responds to the terminal user's keyboard operation. The required information is displayed in real time. The keyboard and display module is composed of a keyboard and an LCD display (or other display terminals) to realize human-computer interaction and display of current power grid information. The terminal stabilized power supply module provides working voltage for the above-mentioned electronic circuit.

Fig. 2 shows another structural form of the electronic transformer of the present invention, wherein the sensing head for measuring voltage and current, the self-powered power supply module, the signal processing module and the anti-theft metering module are the same as Fig. 1, In the structure shown in Figure 1, the self-powered power module, signal processing module and anti-theft metering module are placed on the low-voltage side of the above-mentioned electronic transformer. In the structure shown in Figure 2, the self-powered power module, signal processing module and anti-theft The electrical metering module is placed on the high-voltage side of the above-mentioned electronic transformer.

The working principle of this device is now described in detail in conjunction with the accompanying drawings:

The electronic voltage/current sensing part detects the voltage and current value on the bus (single-phase, three-phase three-wire or three-phase four-wire), and outputs an electrical signal proportional to the voltage and current (the optical signal can be converted by a photoelectric conversion circuit It is an electrical signal), the signal is amplified and shaped, and then input to the A/D conversion circuit; the DSP starts the A/D conversion, and reads the converted digital quantity into its memory; DSP according to the current voltage and current digital quantity, Calculate the user's cumulative power consumption, power factor, harmonics, etc.; DSP can judge the current operating status of the system according to the voltage and current digital quantities, including whether the bus is over-current, over-voltage, under-voltage, etc., and record the fault information to the fault flag. Every once in a while, the DSP sends the above data to the wireless terminal through the wireless networking module (in the form of GSM, CDMA, GPRS, infrared or Bluetooth, etc.). The communication between the wireless networking module and the wireless terminal is two-way. , DSP will restart the wireless transmission according to the response information of the wireless terminal until the communication is successful. At the same time, the signal processing module also reserves digital and optical digital interface signals, which can be conveniently used in digital secondary relay protection and other devices.

The self-powered power supply module provides ±5V and ±15V operating voltages for electronic circuits such as signal processing and DSP. The energy supply module can adopt the mode of taking power from the coil of the high-voltage side of the power grid, or it can be powered by laser, microwave or solar energy. Taking the coil power-taking method as an example, according to the law of electromagnetic induction, when an AC current passes through the busbar, an AC induced electromotive force is generated at both ends of the power supply coil, and the voltage is rectified to obtain a DC power whose amplitude varies within a certain range. The DSP controls the A/D sampling module to sample the DC voltage. When the voltage value is within the set range, the voltage regulator circuit outputs four DC voltages of ±5V and ±15V to supply power to the electronic circuit; when the voltage value exceeds Setting range, the corresponding phenomenon at this time is that when the energy supply module fails to work normally or fails, the DSP automatically switches to the backup battery power supply mode, that is, the battery is connected in series to the voltage stabilizing circuit, and the battery supplies power to the electronic circuit. Due to the existence of the voltage stabilizing capacitor in the voltage stabilizing circuit, and the above-mentioned switching speed is at the ms level, the uninterrupted power supply of the electronic circuit can be realized. Selecting the appropriate backup battery capacity can maintain the normal operation of the circuit for a period of time. In the power supply mode of the power supply coil, the DSP performs A/D sampling on the backup battery voltage at regular intervals. When the battery voltage is detected to be lower than a certain set value, it is considered that the battery is insufficient, and the DSP controls the charging circuit to charge the backup battery. , until its voltage returns to normal. When both the energy supply module and the backup battery fail to work, the DSP stores important user data (such as user power consumption, faults, etc.) into E ² PRORM (or other memory with power-off saving function) for power on again read and use.

The wireless terminal module is located in the local transformer cabinet or adjacent substation, and is mainly composed of a wireless transceiver chip, a terminal signal processing module, a keyboard and display module, and a terminal regulated power supply module. The single-chip microcomputer controls the wireless transceiver chip to receive the user data information on the transformer side and make a response; the user data information is recorded in the memory of the single-chip microcomputer, and the important ones are recorded in the E ² PRORM. Real-time display of network side user information (such as power consumption, power factor, harmonics, faults, etc.) on the LCD according to user requirements. At the same time, the terminal module reserves 485/232 or other communication interfaces, which can communicate with the host computer in the form of bus to realize the unified management of user information.

The working voltage of the electronic circuit in the wireless terminal module is provided by the terminal stabilized power supply module. The terminal stabilized power supply module outputs DC voltages of ±5V and ±15V after the local AC power is rectified and stabilized.

Claims (6)

1, a kind of electronic mutual inductor with anti-stealing electricity function is characterized in that this instrument transformer comprises:

The sensing head, self powered supply module, signal processing module and the anti-electricity-theft metering module that are used for the measuring voltage and the magnitude of current;

Described self powered supply module is connected with described signal processing module, is used to signal processing module that stabilized voltage power supply is provided;

The described sensing head that is used for the measuring voltage and the magnitude of current links to each other with signal processing module, is used to detect user's voltage and current signal, and the light signal or the signal of telecommunication that output is directly proportional with the voltage and current amount are for signal processing module provides the voltage and current signal;

Described signal processing module is used for opto-electronic conversion, amplification, shaping and filtering are passed through in the simulation output of voltage and current, to obtain characterizing the analog signal of user's voltage and current;

Described anti-electricity-theft metering module is by data processing module, wireless communication module, the wireless terminal module is formed, data processing module wherein links to each other with signal processing module, the analog signal that is used for sign user's voltage and current of received signal processing module, after A/D conversion and calculating, obtain the digital signal of power consumption and electric network information, wireless communication module wherein is connected with data processing module, the operation instruction signal that is used to send the digital signal of data processing module and receives wireless terminal, wireless terminal module wherein is used to receive the digital signal of wireless communication module and sends operation instruction signal, shows power consumption and electric network information.

2, electronic mutual inductor as claimed in claim 1, the sensing head that it is characterized in that the wherein said measuring voltage and the magnitude of current, comprise current sensing head and voltage sensor head, current sensing head wherein places the bus of electric power system, and the voltage sensor head places between bus and the earth potential.

3, electronic mutual inductor as claimed in claim 2, the sensing head that it is characterized in that wherein said voltage and current amount are optical profile type or non-optical formula.

4, electronic mutual inductor as claimed in claim 1 is characterized in that wherein said data processing module is calculated by A/D modular converter and electric weight and message processing module is formed; The analog signal conversion that described A/D modular converter will characterize electric current and voltage is a digital quantity; Electric weight calculates and message processing module is made up of first digital signal processor, memory, first digital signal processor calculates user's power consumption, power factor, harmonic wave according to the digital quantity of A/D modular converter output, and obtains the current operation conditions of network system from the digital quantity of A/D modular converter output.

5, electronic mutual inductor as claimed in claim 1, it is characterized in that wherein said wireless terminal module is made up of radio receiving transmitting module, second digital processing unit, memory, keyboard, display terminal and communication interface, described radio receiving transmitting module, memory, keyboard, display terminal and communication interface link to each other with second digital processing unit respectively, and radio receiving transmitting module wherein is used to receive the digital signal of wireless communication module and sends operation instruction signal; Described memory is used to store the digital information that wireless communication module receives; Described keyboard is used to key in user's operational order; Described display terminal is used for the electric weight and the electric network information of explicit user; Described communication interface is used to export user's electric weight and electric network information.

6, electronic mutual inductor as claimed in claim 1 is characterized in that wherein said self powered supply module is made up of power taking coil, voltage stabilizing circuit, charging circuit and battery-powered commutation circuit; Power taking coil wherein links to each other with electrical network, and links to each other with voltage stabilizing circuit by rectifier bridge, and being used for obtaining behind the electric energy from electrical network provides direct current for voltage stabilizing circuit; Voltage stabilizing circuit links to each other with charging circuit, is used to battery pack that charging voltage is provided, and provides working power for the electronic circuit of whole instrument transformer; Battery-powered commutation circuit is connected across between charging circuit and the voltage stabilizing circuit, is used for switching when power failure powering mode.

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